Employees of the mining company, Semafo, have suffered three attacks in Burkina Faso in 15 months, including one on Wednesday that left at least 37 dead.
In July, the international court in The Hague found Bosco Ntaganda guilty of war crimes including murder, rape and sexual slavery.
The attack, which also wounded 60 people, was the third deadly attack on the Semafo mining company in 15 months.
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